One thing to consider is "if you decide to install a #2nd HDD" dual boot, you could have XP as a second OS or Vista as your second OS, SATA makes this easy to setup, or if you want something different Linux is a great OS and comes in many versions and is very secure and stable.

May i ask what Router / Modem / ISP setup will you be using - "eg" - ADSL Wireless, Voyager 2110 ADSL Router, BT Broadband ?.
With a 300w PSU if your going to be using Printer, Scanner, Fax "etc" a powered USB Hub would be a good idea as you will get no power loss from your system, and with 2GB Ram you can afford to allocate extra Ram to your graphics

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